54-5
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 54 Configuring ASLB
Understanding How ASLB Works
Figure 54-2
Client-to-Server ASLB Packet Flow
Table 54-2
Client-to-Server ASLB Packet Flow
Path
Number
VLAN
MAC
Destination
Address
MAC Source
Address
IP Destination
Address
IP Source
Address
Flags
Action
1
10
LocalDirector
MAC
1
1.
This MAC address has an Xtag value of 14 in the Layer 2 table for this packet’s VLAN.
Router MAC
VIP
2
2.
VIP = virtual-IP address.
CIP
3
3.
CIP = client’s IP address.
SYN
Candidate entry in
Layer 3 table
2
20
Server MAC
4
4.
The MAC address of the server that the LocalDirector selected.
Router MAC
1
VIP
CIP
-
Enabler frame
3—N
10
LocalDirector
MAC
1
Router MAC
VIP
CIP
-
Full ASLB MLS
entry created
N + 1
10
LocalDirector
MAC
1
Router MAC
VIP
CIP
FIN/RST
Path 1 redirect
N + 2...
20
Server MAC
Router MAC
1
VIP
CIP
FIN/RST
Path 2
Table 54-3
Client-to-Server ASLB Layer 3 Table Entries
IP Destination
Address
IP Source
Address
Protocol
Ports
VLAN
MAC Destination
Address
MAC Source
Address
VIP
1
1.
VIP = virtual-IP address.
CIP
2
2.
CIP = client’s IP address.
TCP
80/YZ
20
Server MAC
3
3.
MAC address of the server that the LocalDirector selected.
Router MAC
P
A
P
R
Path 1
Path 2
Path 3
P
B
P
M
P
L
P
K
Catalyst 6500
series switches
LocalDirector
Clients
Server pool
S1
S2
S3
VLAN 10
VLAN 20
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